This apocalypse is going to be heavily story-driven, influenced by the players' decisions. Obviously, there'll need to be some kind of "Event Manager". But we're not doing that, exactly.

The difference between a Game Master(GM) and Dungeon Master(DM), is their power.

A Game Master leads the entire server, and can have minor-characters when not doing anything plot related. Very minor.

A Dungeon Master makes small little events, or assists the Game Master where it's seen fit. They are allowed to have a minor character.

To keep the story fresh, a game master will be rotated out with a Dungeon master, at the cost of their character ICly leaving the group for the duration, or dying. It will be roughly 2-4 weeks for a game master's duration, though it can be voted for extension.